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    Wyświetlanie 1-4 z 4
    Tytuł:
    Wpływ ażurowości drzewostanu osłaniającego na wzrost cisa pospolitego (Taxus baccata L.)
    The influence of stand canopy openness on the growth of common yew (Taxus baccata L.)
    Autorzy:
    Niemczyk, M.
    Żółciak, A.
    Wrzesiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1312166.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    drzewa lesne
    ochrona ex situ
    cis pospolity
    Taxus baccata
    wzrost roslin
    powierzchnie zachowawcze
    drzewostany oslaniajace
    gatunki oslonowe
    azurowosc
    common yew
    ex-situ conservation plots
    canopy openness
    Opis:
    The aim of this study was to evaluate the development of common yew, Taxus baccata L., with respect to canopy openness. The plants were growing in ex-situ conservation plantations (established in 2008) in the understory of different tree species. Eleven forest plantations belonging to the following five forest districts were inventoried: Rokita, Baligród, Kołaczyce, Międzylesie and Henryków. In each plantation, the height and height increment of 200 yews were measured and gap light transmission indices were determined. The canopy species affecting yew growth most significantly were oak (Quercus sp.) and Scots pine (Pinus sylvestris L.), followed by Norway spruce (Picea abies Karst.), silver fir (Abies alba L.) and European beech (Fagus sylvatica L.). The most favorable development of yew occurred at 30% canopy openness. An increasing light transmission index correlated with a decrease in the proportion of treelike yews. An insufficient amount of light resulted in a low height increment of yews growing under the canopy and an extended period of direct competition of yews with herbaceous species.
    Źródło:
    Leśne Prace Badawcze; 2015, 76, 1; 42-48
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Do czego służą badania na stałych powierzchniach w Białowieskim Parku Narodowym?
    What is the use of studies carried out on the permanent plots in the Bialowieza National Park?
    Autorzy:
    Bobiec, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1294369.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    ekologia lasu
    Bialowieski Park Narodowy
    lasy
    stale powierzchnie obserwacyjne
    badania naukowe
    ekosystemy lesne
    dynamika ekosystemow
    sukcesja naturalna
    szkodniki roslin
    kornik drukarz
    gradacja
    ecological disturbances
    ecological history
    plots’ representativeness
    spatial scale
    spruce bark beetle outbreak
    stand
    dynamics
    Opis:
    The purpose of the strictly protected area of the Białowieża National Park (BNP) established in early 1900s, was to protect a compact block of the Białowieża forest from any direct human influence and activity. Its founders considered it a “laboratory of nature.” In 1936, five rectangular plots with a total area of ca. 15.5 ha (ca. 0.3% of the BNP) were set up for regular monitoring of stand development with regards to the initial state and variability of soil conditions. During the first 76 years of the project, a steady increase in the proportion of hornbeam and lime tree at the expense of shade-intolerant species was observed. This trend has been interpreted by the researchers involved in the monitoring of the permanent BNP plots to constitute a biodiversity-threatening development caused by preservation efforts. Such an interpretation has been widely incorporated in the public debate by political authorities and the forestry sector. In this critical article I challenge the major arguments presented by the key expert in silviculture, prof. B. Brzeziecki. My criticism is directed at the methodological approach as well as at the data interpretation.
    Źródło:
    Leśne Prace Badawcze; 2016, 77, 4
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ metod trzebieży na wskaźniki przewagi konkurencyjnej drzew dorodnych w jednowiekowych drzewostanach sosnowych II i III klasy wieku
    The influence of different thinning methods on dominance coefficients of future crop trees in even-aged Scots pine stands
    Autorzy:
    Zachara, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1316012.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    drzewostany sosnowe
    drzewostany jednowiekowe
    klasy wieku
    drzewostany II klasy wieku
    drzewostany III klasy wieku
    trzebieze
    sosna zwyczajna
    Pinus sylvestris
    drzewa dorodne
    cechy biometryczne
    wskazniki przewagi konkurencyjnej
    Scots pine
    permanent experimental plots
    dominance coefficients
    thinning intensity
    Opis:
    The research aim was to evaluate the influence of different thinning methods on future crop tree growth. Investigations were conducted on permanent Scots-pine experimental plots, established in 1960s and 1970s in Kozienice, Łąck, Parciaki and Janów Lubelski Forest Districts. To assess the response to thinning of future crop trees, their dominance coefficients were used. These are defined as quotients for each given future crop tree diameter and average stand diameter (WP1), the average dominant layer diameter (WP2) and the average diameter of 100 thickest trees per hectare (WP3). The difference between each coefficient value at the beginning and at the end of the measurement period was used as a measure of the thinning effect. On Kozienice, Łąck and Parciaki plots the differences between treatments were significant, especially in the period after first thinning. The increase of WP3 coefficient occurred in a case of strong thinning – TS1 and TS2. On plot Parciaki also the moderate thinning TU1 and TU2 had a significant influence on change of this coefficient. On plot Janów Lubelski the influence of treatment has not been stated in the first 5-year period but in the next one. Analyses of changes in the dominance coefficients confirmed the hypothesis that the WP3 coefficient is very useful as it is the most stable indicator of future crop-tree position in a stand. On Kozienice, Łąck and Parciaki plots the significant differences between treatments were stated, especially in the period after first thinning. The influence of thinning treatment on the plot Janów Lubelski was not considered for the first 5-year period but in the next one. All reactions to thinning were slower on this plot, possibly because of the relatively poor site conditions. This was a longterm effect. The results obtained suggest that very intense thinning of Scots pine stands should only be implemented under a restricted set of conditions – in healthy, not neglected, forest stands. Classical moderately-selective thinning is preferable to intense thinning and is the most convenient option for pine stands.
    Źródło:
    Leśne Prace Badawcze; 2014, 75, 1; 31-45
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tempo i kierunki zmian składu gatunkowego drzewostanów naturalnych w wybranych zbiorowiskach leśnych Puszczy Białowieskiej
    Rate and direction of changes in tree species composition of natural stands in selected forest associations in the Bialowieza Forest
    Autorzy:
    Paluch, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1313006.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    Puszcza Bialowieska
    drzewostany naturalne
    zbiorowiska lesne
    sklad gatunkowy
    bor swiezy brusznicowo-sosnowy
    bor mieszany trzcinnikowo-swierkowy
    grad miodownikowo-grabowy
    grad typowy
    grad trzcinnikowy
    leg olszowo-jesionowy
    zmiany skladu gatunkowego
    podobienstwo skladu gatunkowego
    stale powierzchnie obserwacyjne
    hornbeam expansion
    natural stands
    permanent study plots
    ash dieback
    Białowieża forest
    Opis:
    The main aim of the study was to determine changes in the species composition and structure of natural tree stands in the Białowieża Forest (BF), which occurred in the years 1975-2012, as well as to evaluate their trends, directions and rate. The study was carried out on 121 permanent research plots (50×50m), which represented the most important forest phytocenoses in BF, i.e. fresh pine-whortleberry forest Vaccinio vitis-idaeae-Pinetum Sokoł. 1980, fresh mixed spruce-reed grass forest Calamagrostio-Piceetum Soko³. 1968, oligotrophic form of hornbeam - bastard balm forest Melitti-Carpinetum Soko³. 1976, different forms of linden- hornbeam forest: Tilio-Carpinetum Tracz. 1962, alder-ash forest Fraxino-Alnetum W. Mat. 1952 and sub-boreal spruce forest on bog moss Sphagno girgenshonii- Piceetum Polak. 1962. On the plots selected, there was measured the diameter at breast height (DBH) of all trees, as well as every tree and shrub up to 1.3 m high was counted and described with reference to species. The measurements and observations were regularly repeated every 10-15 years. The results showed that over the last period of nearly 40 years, there has increased a share of common hornbeam Carpinus betulus L. in the structure of forest stands in numerous BF associations. This tree species has expanded into different forest habitats including poor, medium fertile and wetland sites. The results obtained indicate a trend towards formation of linden-hornbeam forests in BF phytocenoses. The most evident changes were recorded in hornbeam - bastard balm forest. In natural conditions of the majority of forest associations analyzed, there prevailed hornbeam trees in forest regeneration, except for the stands in fresh mixed pine forest and spruce forest on bog moss. In the latter two cases, hornbeam showed signs of its presence in the last observation period. Norway spruce (Picea abies L.) retreated into oligotrophic forest associations. In the recent decades, spruce populations have been dramatically reduced in the stands in mixed coniferous and different kinds of broadleaved forests. There have also decreased a share of light-demanding tree species, such as Scots pine (Pinus silvestris L.), pedunculate oak (Quercus robur L.) and silver birch (Betula pendula L.) in BF tree stands, including their regeneration-layer. Especially, Scots pine regeneration has not been successful. In the short period of time (about 15 years) there has been observed rapid and outsized reduction of ash Fraxinus excelsior L. populations in natural conditions of alder-ash forests. All through the last 10-15 years, there has been also observed increased rate of change in stand species composition. The trend and rate of change in stand species composition point out to a possibility of human intervention towards stimulation of natural regeneration so as to preserve valuable populations of threatened tree species in the Białowieża Forest.
    Źródło:
    Leśne Prace Badawcze; 2014, 75, 4; 385-406
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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